This is something I came up with, then discovered it has a name, the infinity scarf. This home-made version is super simple and you can whip one up in just a coupla minutes. I wear one all the time now that it's under-heating weather. It's really easy to make.
The name "infinity scarf" was someone's brainchild, so the concept is not unique. The simplicity and ease of production here to tell makes this what I feel is my signature contribution to civilization. You're welcome.
It is basically the trunk part of a T-shirt cut to a desired width and wrapped around your neck to keep the draft out.
Step 1: Find a T-shirt you don't need
A pair of stout scissors. Lightweight scissors will make the job a little harder.